Implementation of the Change of Responsibility pattern as sugg by GoF for the .NET Plat:
The Framework will have following components:
Chain of Responsibility Controller
ActionChain Interface
ActionEvent Interface
CoR Properties File and XML Adapter

ADIAS, or "Agent driven Interface Adaptation System" is a open-source Content adaptation system for mobile devices, which can adapt the content for to be rendered by WML clients, XHTML-MP clients and even J2ME clients.

Catharsis
The Web-Application Framework gathering best-practices.
ASP.NET MVC, NHibernate 2.0.
Real Multi-tier and strongly OOP architecture.
Inheritance is a key feature for code reuse,
Polymorphisms is the only way to communicate among layers

Library that handles persisting plain .NET objects to and from an underlying relational database. Using attributes in your source code, you define validation and other behaviour.
Supports hineritance, aggregation and persistant events.

Store multiple files in one storage (file-system), identified with a GUID. Accessing /reading/ of the data should be fast, multi threaded. Store up to at least 1 million files in one storage, big or small. Written in C# (.NET)

Webstensible is an extensible application layer for building robust, web-based business applications. The framework is written in DotNet. All components are loaded via reflection and designed to be replaced to match ever-changing business requirements.